Glass brick



FIG. 1: is a front perspective view of a glass brick, showing my new design;

FIG. 2: is a front view thereof;

FIG. 3: is a side view thereof;

FIG. 4: is a front perspective view as in FIG. 1 but partially in transverse cross-section;

FIG. 5 is an enlarged view of a portion of the inner surface visible in FIG. 4; and

FIG. 6 is a sectional view taken on line VI--VI of FIG. 5.

The other sides and the back are substantially like the respective side and front shown. 

The ornamental design for a glass brick, as shown and described. 